Add OpenAPI contract and generated frontend client

Program.cs

@@ -47,6 +47,7 @@ builder.Services.AddScoped<ResultsWorkflowService>();
 builder.Services.AddScoped<StateWorkflowService>();
 builder.Services.AddSingleton<AuthAttemptMonitor>();
 builder.Services.AddSingleton<StateChangeNotifier>();
+builder.Services.AddOpenApi("v1");
 
 builder.Services.ConfigureHttpJsonOptions(options => { options.SerializerOptions.Converters.Add(new JsonStringEnumConverter()); });
 
@@ -160,6 +161,7 @@ app.UseDefaultFiles();
 app.UseStaticFiles();
 
 app.MapHealthChecks();
+app.MapOpenApi("/openapi/{documentName}.json");
 app.MapAuthEndpoints();
 app.MapStateEndpoints();
 app.MapSuggestEndpoints();